SUMMARY: This AD was prompted by a report of corrosion found on the main fitting of the ose landing gear (NLG) leg in the vicinity of the dowel pin bushes retaining the lower steering flange. This AD requires modifying the NLG main fitting by adding primer paint to the cadmium around the dowel bush holes. The FAA is issuing this AD to prevent NLG main fitting rupture, which could result in an NLG collapse.